Aw crap - The Chaudown achievement is glitched for me >.<
I've completed the game with Scott, Ramona, Kim and Stills, unlocked Nega Scott and defeated Mr Chau.
I've also summoned Mr & Mrs Chau, and they've both hit enemies (and when Knives is summoned, she's also hit/stunned enemies).
Are other people still having difficulties with this? I've googled it, and I seen that people were talking about deleting the game and starting again - but I'm sure you understand that if I have to sit through those end credits again... I might go a bit mad
Any help/advice would be highly appreciated x

you should try reloading scott pilgrim game and do the characters again 1 by 1 and make sure they hit someone. scott ramona stills kim and negascott. just do the summons when there are alot of enemies near you. mr chau is unlocked in the map and you fight him in the lightning field. whatever character u defeat him with you can summon mr chau. i got this achievement a while ago so if im wrong sowwyy lol

I haven't seen it mentioned at all, but you can skip through the credits. The game saves some time after the final boss is defeated, at which point you can quit out to the dashboard and just go back into the game again. Soooooo much quicker than waiting for the credits to finish!

In Shopping District:Step 1: Go to the Delicious Cup ShopStep 2: Buy the Tea and get it TAKE AWAY. You can buy any snack but I just got this one as it was the cheapest closest to starting Shopping District.Step 3: Go outside and enter the code while holding Left Trigger + Right Trigger
Up,Up, Down, Down, Left, Right, Left, Right, B, A
This sacrifices a life for $50, but as you have a snack you won't lose your life and come back with 10HP.Step 4: Collect the $50 in coins from the groundStep 5: Repeat steps 2-4 until you have approx $650 or greaterStep 6: Go to the video shop and pay your fineStep 7: Buy Seven Shaolin Masters until your stats are maxed at 100Step 8: Buy Alone and Disturbed until you are level 16Step 9: Buy The Mystical Head until you have 9 livesStep 10: Fly through the game without any problems

I unlocked the Gourmet achievement without having to by the Ambrosia (from Wallace's Mystery Shop), and so did a friend of mine.

I do not know whether the achievement glitched or is the Ambrosia really needed. Just a heads up that you might not need it. Maybe someone can confirm this by buying the Ambrosia last when going for this achievement.

I unlocked the Gourmet achievement without having to by the Ambrosia (from Wallace's Mystery Shop), and so did a friend of mine.

I do not know whether the achievement glitched or is the Ambrosia really needed. Just a heads up that you might not need it. Maybe someone can confirm this by buying the Ambrosia last when going for this achievement.

I was just going to post the same thing. I had missed Wallace's on my run through, so went in to buy those last two. When I purchased Tlaloc's Feast the achievement popped. You can save the hefty price for the Ambrosia because it isn't necessary.

Yeah. I ate every food and nothing. I think GOURMET maybe is glitched too...

Now I know what I did wrong: When I tried to eat the 1up from the Wallace's secret shop I always received the message that I couldn't buy (or something). That's because I had 9 lives! You need to die to buy that 1up to receive the achievement! Stupid me!